Pointers for new riders
Well Seeing that you have the good since to ask the opionion right off shows that you are a step above many new riders. First off a lot of the time frames I will mention will really depend on how often you ride and how quickly you become comfortable useing the skills you learn. For the first month or so I would say try to stay to rural or less populated roads with minimal cross traffic and stick with what the speed limits are for the roads your on unless you feel the need to go slower (never take actions ON THE ROAD that push the limits of your ability). Always assume that other drivers do not see you. Avoid the expressway for the first couple months (expressway ridin isn't any fun anyway) Wear all of the safty gear such as a GOOD helmet that fits well, boots, jeans or sturdier, and a motorcycle jacket. I don't know if you are dead set on the cbr 600 as your first bike but I would say go to a few dealers and sit on a few different types of bikes and choose something (no larger than a 600 an a sport bike) ergonomics are very important, once you have decided on a bike try to find a used one. One of the best things you can do to stay safe out there is to take a BASIC RIDER COURSE in your area, they will go through a lot of the fundamentals as well give a lot of good advice for navigating traffic, lane position, lesser thought about hazzards. In ohio the class is $25. there truly is enough stuff I could say to write a book.
DRESS FOR THE SLIDE NOT FOR THE RIDE!
I see you have already taken the course. Good move!